Dental chair.



C. F. BETTS.

DENTAL CHAIR.

APPLICATION FILED MAR. Is. I9I5.

l ,293,572 v Patented Nov. 7, 1916.

3 SHEETS-SHEET I.

@I MQW Y Patented Nov. 7, 1916.

3 SHEETS-SHEET 2 C. F. BETTS.

DENTAL CHAIR,

AFPLlcATloN man MAR.16. 1915.

Patented Nov.- 7, 1916.

3 SHEETS-SHEET 3.

\ L k X Uff/bilig] UMSFED `STATES PATENT FUELS CHARLES FREDERICK BETTs, on NORTH "FINCHLEY, LoNnoN, ENGLAND, AssIGNoR To l DENTAL MANUFACTURING Co., LTD., oRLoNnoN,fENeLAND.

DENTAL CHAIR.

- Speciicaton ofLetters Patent.

Appicatioii meaMareh 1e, 1915. serial No. 14,807.

Athe following is a specification.

hinged to a base,

' panyingV drawings,

My invention relates to improvements in easily portable dental .chairs adapted for transport purposes and capable of being easily moved from one place to another.; My invention comprisesa chair seat frame so arranged that when in the position for use, the chairy is rigid and its parts4 such as the chair seat, foot rest, head rest and arm rests are adjustable as in an ordinary dental chair, while when out of use the chair and Vseat with'V its head rest and foot rest can be folded together without being disconnected so as to lie at'against the chair base in a very small compass.

:My invention is illustrated in the accomin which :e

`Figure 1 shows a photographic perspec- 1 tive view'of the chair in position for use.

Figs. 7 and 8 auxiliary arm rest.

Fig'. 2Ashows a partial side'view. Fig. 3 'shows a vsectional elevation on the lineA-B r of F ig.l 2. Fig. 4 shows a detail Vviewof the shows a detail View ofthe foot rest clamp. Y Fig. 6 shows a side elevation of the chair folded'in a case adapted to form the base of the chair when in'use.

head rest. Fig. 5

respectively of the removable or auxiliary arm rest, and Figs. 9 and 10 show plan and sectional detail viewsof the sockets forl the lAccording to my invention QI* rigidly mount Aon the chair base 1V which is convenientlyin the form of a case as shownin Figs. l and 6, airs of supports 2 for the front legs 3 and back legs 4 of the chair. The said front Vand back .pairs of legs are respectively hinged at'their lower endsto the said 'pairsJ 'of supports 2 vand at their upper ends to pivots 5 mounted on the frame 6 of the chair seat.` The length` ofthe front paireof legs is so proportioned in relation to the length of the back pair of legs 4 of the seat that y folded over with its rframe 'andv reversed so as to lieflat 'with' its legs aganstthe chair base las shown 1n' Fig. 6; vll`h`e'front pair in the county of London, England, l

desired,

show front and 4side elevations when desired said seat ycan be oflegsk 3 of the seat are adapted to carry a foot rest yThe inner end of the otally mounted 'upcn a spindleS (Fig.

Patented Nov. '7, 1916.

foot rest 7 is piVP with apair of suitablydshaped projections or larms' 10l 'respectively ada-pted to engage agalnstl `shoulders 11 projecting `from lthe said split sleeves 9 embracing the frontl legs of the chair. When pressureis brought to bear upon the foot restfthe saidprojections n10 'are pressed downfagai'nstthe shoulders 11 of said sleeves, thus causing'th'em to lgrlp the legs of the chair and tolo'ck thefoot rest 7 intheVx position kin which itis set. If additional locking means may be employed. The upper ends of the sadj front pair of legs 3 are provided withv latches suit'n ably in theffo'rm of hooked members A1 2as shown which if desired may be controlled springs. The said hooked members 12 are respectively adapted to engage over pins 13projecting from each side frame 6 of the seat. The said pins are preferably provided withthumb' nuts 14 adapted to be screwed against said hooked members when in gagement with said pins, thus locking said hooked members and consequently locking the chair seat vand preventing it from collapsingV into the folding position when'the chair is'in useas shown in Fig. 1. y

As shown in detailin Figs. 2 and 3the chair seat`15is adapted t0 be raised and tilted to a desired position above its frame 6. The under` side of the chair seat 15 is provided with a pair of lugs 16 having attached thereto heads 17 of telescoping lmembers 18 adapted to telescope in the upper ends of the back legs 4'of the chair. The said telescop ing membersV 18 are conveniently locked 'in Y position byset screw 19 when the chair seat Thev pawl 22.*pivotedt0 the rear `arms 23 of Ythe movable arm' rest 24 holds said 'arm rest in thepositon'in which it is set. In orderI to. allow-of said arm rest being folded 6 is engaged with one'o'rl y the series of ratchet teeth 21 ar-v ranged on the under surface of saidhseat 15;I

means of set screws 27. The

.lows of the angle of it is mounted on parallel arms 23 With piv oted joints 44 on the upper ends of said arms and pivoted joints 45 on their lower ends. -The said joints 45 are mounted upon secondary hinged pieces 46 pivoted in a plane at right angles to the said pivots 45 by means of pins 47 passing through lugs 48 on the main frame-Work 6. lf he back end of .the seit frame 6 is provided W'ith'up'rights The said up.

25 mounted on pivots 49.`

rights carry the sliding back 26 supported onsaid uprights by guides 28 and adapted position by uprights 25 carrying the chair back are provided With pivotal ratchets 29 adaptedl tobe engaged by paivls 30 arranged at the back of thechair seat. This p aWl and ratchet mechanism' althe back being set to to be locked' in thev desired Suit the patient. v

`4The back is adapted to carry in a central position the slidingvupright 32 on which is mounted the head rest 37 shown in Fig.Y 4 which is mounted between clamping pieces 4l and 42 and is adapted to be clamped in the desired position by means ofthe hand screw 43. The sliding upright 32 can be locked in the desired position by any convenient means such as a set screw 38. The chair of my invention may also be fitted With removable or auxiliary arm rests 33, the ends 34 of said arm rests being adapted to rest in the sockets 35 in the chair seat, as shown in Figs. 7, 8, 9 and 10. The said arm rests 33 can be reversed according to the Width of seat required.

AWhat I claim is l. .A folding dental chair comprising a base, a seat frame, a movable chair seat within said frame, means for raising said chair seat and tilting it to a desiredposition above lsaid frame, a back pair of legs pivoted to said base a front pair of legs pivoted to said base and adapted to carry With said back pair of legs said seat frame and so proportioned in relation' to the back pair of legs that saidseat can be. moved Witu 1n its frame and ythen folded over with the frame and reversed so as to lie flat With said pairs of legs against said chair base.

A dental chair comprising a' base, a seat frame, a back. pair of legspivoted'to said base, a front pairof legs pivoted to said base and adapted to carry with said back pair of legs said seat frame and so proportioned in relationto the back pair of legs that said seat frame can be folded over and reversed so as to lie flat with said pairs of legs against said chair base', a movable chair seat adapted to lie Within said frame when reversed and to ,be raised and tilted to a 'de- Sired position above said frame-When inthe extended Position a pair aflussnivoted ta thegunderaidefe Saat; .te-lessenaar upon a tubular pivot 40 members attached to said lugs and adapted pair "of'legs, a series of ratchet teeth on the underside of saidV chair seat, and Ypawls pivoted to said seat frame and adapted to engage with one or other of said ratchet teeth. Y

3. Ai folding dental chair comprising a base, a seat frame, a movable chair seat Within said frame, means for raising said chair seatV and tilting it to a desired position above said frame, a back pair of legs pivot.:n ed to said basej a `front pair of legs pivot-ed to said base and adapted to carry with said back pair of legs said seat frame'- and so proportioned .in relation to the back pair 0f legs that said seat can be moved Within its fralne'and then folded 'over-With the frame and reversed so as to liel flat with said pairs of legs against said chair base, a pair of latches respectively pivotally mounted upon said fronty pair of legs, members projecting from the sides ofthe seat frame and adapted to be engaged by said latches and to hold lsaid chair in the extended position.

4. A 'folding dental chair comprising a base, a seat frame, a movable chair seat Within said frame, means for raising said chair seat and tilting it to ay desired position above said frame, la back pair of legs pivoted to said base, a front pair of legs pivoted to said base and. adapted to carry with said back pair of legs said seat frame and so proportioned in relation to the back pair of legs that said seat can be moved Within its frame and then folded overvvith the frame and reversed so as to lie flat with said pairsof legs against said chair base, a pair of hooked members respectively .pivotally mounted on said front pair of legs,.pins prof jecting from the sides of the' seat frame adapted to be engaged by said hooked members, thumb nuts adapted to be screwed against said hooked members when -in engagement with said pins to lock said chair seat `when in the extended position.

base, 'a seat frame, a movable chair Seat within said frame, means for raising said chair seat and tilting it to a desired position above said frame, a back pair of legs pivoted to said base, a-front pair of legs pivoted to saidbase and adapted to carry with said back pair of legssaidseat frame and so. proportioned in relation to the back pair of legs that vsaid seat can, be moved Within its frame and then folded over with the frame and reversed so as to lie flat with said pairs of legs against said chair base, a folding arm rest pivotallyfrv attached to the chair frame, 'a pawl pivoted to said arm rest andbase a; .seattrama nera-ble; @hair n@ Within said frame,xneans for raising said Chair seat and tilting it to ardesired position above said frame, a back pair of legs pivoted to said base, a front pair of legs pivoted to said base andv adapted to carry With `said back pair of legs said seat frame and so proportioned in relation to the back pairof legs that said seat can be moved Within its frame and then folded over with the frame and reversed so as to lie fiat With said pairs of legs against said chair base, a pair of lugs mounted on the Chair sea-t frame, carrying members pivoted to said lugs, parallel arms l -lpivotally mounted onsaid carrying members,

'in a plane atright angles to the pivots of 15 said carrying members and a foldingarm Y rest pivotally mounted on said parallel arms.V

l In testimony whereof I have signed my name to this specieation in they presence of two subscribing Witnesses. l

CHARLES FREDERICK BETTS. Witnesses: n

ARTHUR J. STEPHENS. LEONARD S. HAYNEs.

Copies of this patent may be obtained for Vfive cents eachQby addressing' the Commissioner of'Patents,

l Washington, D. C. 

